<s>
Session	B-Protocol
multiplexing	I-Protocol
in	O
a	O
computer	B-Architecture
network	I-Architecture
is	O
a	O
service	O
provided	O
by	O
the	O
transport	O
layer	O
(	O
see	O
OSI	O
Layered	O
Model	O
)	O
.	O
</s>
<s>
An	O
example	O
of	O
session	B-Protocol
multiplexing	I-Protocol
—	O
a	O
single	O
computer	O
with	O
one	O
IP	O
address	O
has	O
several	O
websites	O
open	O
at	O
once	O
.	O
</s>
